1/* 2 * Copyright (c) 2002 Jindrich Makovicka <makovick@gmail.com> 3 * Copyright (c) 2011 Stefano Sabatini 4 * Copyright (c) 2013 Jean Delvare <khali@linux-fr.org> 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with FFmpeg; if not, write to the Free Software Foundation, Inc., 20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 21 */ 22 23/** 24 * @file 25 * A very simple tv station logo remover 26 * Originally imported from MPlayer libmpcodecs/vf_delogo.c, 27 * the algorithm was later improved. 28 */ 29 30#include "libavutil/common.h" 31#include "libavutil/imgutils.h" 32#include "libavutil/opt.h" 33#include "libavutil/pixdesc.h" 34#include "avfilter.h" 35#include "formats.h" 36#include "internal.h" 37#include "video.h" 38 39/** 40 * Apply a simple delogo algorithm to the image in src and put the 41 * result in dst. 42 * 43 * The algorithm is only applied to the region specified by the logo 44 * parameters. 45 * 46 * @param w width of the input image 47 * @param h height of the input image 48 * @param logo_x x coordinate of the top left corner of the logo region 49 * @param logo_y y coordinate of the top left corner of the logo region 50 * @param logo_w width of the logo 51 * @param logo_h height of the logo 52 * @param band the size of the band around the processed area 53 * @param show show a rectangle around the processed area, useful for 54 * parameters tweaking 55 * @param direct if non-zero perform in-place processing 56 */ 57static void apply_delogo(uint8_t *dst, int dst_linesize, 58 uint8_t *src, int src_linesize, 59 int w, int h, AVRational sar, 60 int logo_x, int logo_y, int logo_w, int logo_h, 61 unsigned int band, int show, int direct) 62{ 63 int x, y; 64 uint64_t interp, weightl, weightr, weightt, weightb; 65 uint8_t *xdst, *xsrc; 66 67 uint8_t *topleft, *botleft, *topright; 68 unsigned int left_sample, right_sample; 69 int xclipl, xclipr, yclipt, yclipb; 70 int logo_x1, logo_x2, logo_y1, logo_y2; 71 72 xclipl = FFMAX(-logo_x, 0); 73 xclipr = FFMAX(logo_x+logo_w-w, 0); 74 yclipt = FFMAX(-logo_y, 0); 75 yclipb = FFMAX(logo_y+logo_h-h, 0); 76 77 logo_x1 = logo_x + xclipl; 78 logo_x2 = logo_x + logo_w - xclipr; 79 logo_y1 = logo_y + yclipt; 80 logo_y2 = logo_y + logo_h - yclipb; 81 82 topleft = src+logo_y1 * src_linesize+logo_x1; 83 topright = src+logo_y1 * src_linesize+logo_x2-1; 84 botleft = src+(logo_y2-1) * src_linesize+logo_x1; 85 86 if (!direct) 87 av_image_copy_plane(dst, dst_linesize, src, src_linesize, w, h); 88 89 dst += (logo_y1 + 1) * dst_linesize; 90 src += (logo_y1 + 1) * src_linesize; 91 92 for (y = logo_y1+1; y < logo_y2-1; y++) { 93 left_sample = topleft[src_linesize*(y-logo_y1)] + 94 topleft[src_linesize*(y-logo_y1-1)] + 95 topleft[src_linesize*(y-logo_y1+1)]; 96 right_sample = topright[src_linesize*(y-logo_y1)] + 97 topright[src_linesize*(y-logo_y1-1)] + 98 topright[src_linesize*(y-logo_y1+1)]; 99 100 for (x = logo_x1+1, 101 xdst = dst+logo_x1+1, 102 xsrc = src+logo_x1+1; x < logo_x2-1; x++, xdst++, xsrc++) { 103 104 /* Weighted interpolation based on relative distances, taking SAR into account */ 105 weightl = (uint64_t) (logo_x2-1-x) * (y-logo_y1) * (logo_y2-1-y) * sar.den; 106 weightr = (uint64_t)(x-logo_x1) * (y-logo_y1) * (logo_y2-1-y) * sar.den; 107 weightt = (uint64_t)(x-logo_x1) * (logo_x2-1-x) * (logo_y2-1-y) * sar.num; 108 weightb = (uint64_t)(x-logo_x1) * (logo_x2-1-x) * (y-logo_y1) * sar.num; 109 110 interp = 111 left_sample * weightl 112 + 113 right_sample * weightr 114 + 115 (topleft[x-logo_x1] + 116 topleft[x-logo_x1-1] + 117 topleft[x-logo_x1+1]) * weightt 118 + 119 (botleft[x-logo_x1] + 120 botleft[x-logo_x1-1] + 121 botleft[x-logo_x1+1]) * weightb; 122 interp /= (weightl + weightr + weightt + weightb) * 3U; 123 124 if (y >= logo_y+band && y < logo_y+logo_h-band && 125 x >= logo_x+band && x < logo_x+logo_w-band) { 126 *xdst = interp; 127 } else { 128 unsigned dist = 0; 129 130 if (x < logo_x+band) 131 dist = FFMAX(dist, logo_x-x+band); 132 else if (x >= logo_x+logo_w-band) 133 dist = FFMAX(dist, x-(logo_x+logo_w-1-band)); 134 135 if (y < logo_y+band) 136 dist = FFMAX(dist, logo_y-y+band); 137 else if (y >= logo_y+logo_h-band) 138 dist = FFMAX(dist, y-(logo_y+logo_h-1-band)); 139 140 *xdst = (*xsrc*dist + interp*(band-dist))/band; 141 if (show && (dist == band-1)) 142 *xdst = 0; 143 } 144 } 145 146 dst += dst_linesize; 147 src += src_linesize; 148 } 149} 150 151typedef struct DelogoContext { 152 const AVClass *class; 153 int x, y, w, h, band, show; 154} DelogoContext; 155 156#define OFFSET(x) offsetof(DelogoContext, x) 157#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM 158 159static const AVOption delogo_options[]= { 160 { "x", "set logo x position", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, 161 { "y", "set logo y position", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, 162 { "w", "set logo width", OFFSET(w), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, 163 { "h", "set logo height", OFFSET(h), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS }, 164 { "band", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 4 }, 1, INT_MAX, FLAGS }, 165 { "t", "set delogo area band size", OFFSET(band), AV_OPT_TYPE_INT, { .i64 = 4 }, 1, INT_MAX, FLAGS }, 166 { "show", "show delogo area", OFFSET(show), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS }, 167 { NULL } 168}; 169 170AVFILTER_DEFINE_CLASS(delogo); 171 172static int query_formats(AVFilterContext *ctx) 173{ 174 static const enum AVPixelFormat pix_fmts[] = { 175 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, 176 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, 177 AV_PIX_FMT_YUVA420P, AV_PIX_FMT_GRAY8, 178 AV_PIX_FMT_NONE 179 }; 180 181 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); 182 return 0; 183} 184 185static av_cold int init(AVFilterContext *ctx) 186{ 187 DelogoContext *s = ctx->priv; 188 189#define CHECK_UNSET_OPT(opt) \ 190 if (s->opt == -1) { \ 191 av_log(s, AV_LOG_ERROR, "Option %s was not set.\n", #opt); \ 192 return AVERROR(EINVAL); \ 193 } 194 CHECK_UNSET_OPT(x); 195 CHECK_UNSET_OPT(y); 196 CHECK_UNSET_OPT(w); 197 CHECK_UNSET_OPT(h); 198 199 av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d, w:%d h:%d band:%d show:%d\n", 200 s->x, s->y, s->w, s->h, s->band, s->show); 201 202 s->w += s->band*2; 203 s->h += s->band*2; 204 s->x -= s->band; 205 s->y -= s->band; 206 207 return 0; 208} 209 210static int filter_frame(AVFilterLink *inlink, AVFrame *in) 211{ 212 DelogoContext *s = inlink->dst->priv; 213 AVFilterLink *outlink = inlink->dst->outputs[0]; 214 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); 215 AVFrame *out; 216 int hsub0 = desc->log2_chroma_w; 217 int vsub0 = desc->log2_chroma_h; 218 int direct = 0; 219 int plane; 220 AVRational sar; 221 222 if (av_frame_is_writable(in)) { 223 direct = 1; 224 out = in; 225 } else { 226 out = ff_get_video_buffer(outlink, outlink->w, outlink->h); 227 if (!out) { 228 av_frame_free(&in); 229 return AVERROR(ENOMEM); 230 } 231 232 av_frame_copy_props(out, in); 233 } 234 235 sar = in->sample_aspect_ratio; 236 /* Assume square pixels if SAR is unknown */ 237 if (!sar.num) 238 sar.num = sar.den = 1; 239 240 for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) { 241 int hsub = plane == 1 || plane == 2 ? hsub0 : 0; 242 int vsub = plane == 1 || plane == 2 ? vsub0 : 0; 243 244 apply_delogo(out->data[plane], out->linesize[plane], 245 in ->data[plane], in ->linesize[plane], 246 FF_CEIL_RSHIFT(inlink->w, hsub), 247 FF_CEIL_RSHIFT(inlink->h, vsub), 248 sar, s->x>>hsub, s->y>>vsub, 249 /* Up and left borders were rounded down, inject lost bits 250 * into width and height to avoid error accumulation */ 251 FF_CEIL_RSHIFT(s->w + (s->x & ((1<<hsub)-1)), hsub), 252 FF_CEIL_RSHIFT(s->h + (s->y & ((1<<vsub)-1)), vsub), 253 s->band>>FFMIN(hsub, vsub), 254 s->show, direct); 255 } 256 257 if (!direct) 258 av_frame_free(&in); 259 260 return ff_filter_frame(outlink, out); 261} 262 263static const AVFilterPad avfilter_vf_delogo_inputs[] = { 264 { 265 .name = "default", 266 .type = AVMEDIA_TYPE_VIDEO, 267 .filter_frame = filter_frame, 268 }, 269 { NULL } 270}; 271 272static const AVFilterPad avfilter_vf_delogo_outputs[] = { 273 { 274 .name = "default", 275 .type = AVMEDIA_TYPE_VIDEO, 276 }, 277 { NULL } 278}; 279 280AVFilter ff_vf_delogo = { 281 .name = "delogo", 282 .description = NULL_IF_CONFIG_SMALL("Remove logo from input video."), 283 .priv_size = sizeof(DelogoContext), 284 .priv_class = &delogo_class, 285 .init = init, 286 .query_formats = query_formats, 287 .inputs = avfilter_vf_delogo_inputs, 288 .outputs = avfilter_vf_delogo_outputs, 289 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, 290}; 291